Brownout Reset (Bor); Figure 9. Bor Thresholds - ST STM32F410 Reference Manual

RM0401
4.2.2

Brownout reset (BOR)

During power on, the Brownout reset (BOR) keeps the device under reset until the supply
voltage reaches the specified V
V is configured through device option bytes. By default, BOR is off. 3 programmable
BOR
V threshold levels can be selected:
BOR
•
BOR Level 3 (VBOR3). Brownout threshold level 3.
•
BOR Level 2 (VBOR2). Brownout threshold level 2.
•
BOR Level 1 (VBOR1). Brownout threshold level 1.
Note: For full details about BOR characteristics, refer to the "Electrical characteristics" section in
the device datasheet.
When the supply voltage (V
generated.
The BOR can be disabled by programming the device option bytes. In this case, the
power-on and power-down is then monitored by the POR/ PDR or by an external power
supervisor if the PDR is switched off through the PDR_ON pin (see
reset (POR)/power-down reset
The BOR threshold hysteresis is ~100 mV (between the rising and the falling edge of the
supply voltage).
threshold.
BOR
) drops below the selected V
DD
(PDR)).

Figure 9. BOR thresholds

RM0401 Rev 3
Power controller (PWR)
threshold, a device reset is
BOR
Section 4.2.1: Power-on
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